MC68HC05C8A Datasheet, PDF (91/116 Pages) Motorola, Inc – Microcontrollers

13.9 3.3-V Control Timing
3.3-V Control Timing
Characteristic⁽¹⁾
Symbol
Min
Max
Unit
Oscillator frequency
Crystal
External clock
f_OSC
—
dc
2.0
MHz
2.0
Internal operating frequency
Crystal
External clock
Internal clock cycle time
Crystal oscillator startup time
Stop recovery startup time (crystal oscillator)
RESET pulse width
f_OP
t_CYC
t_OXOV
t_ILCH
t_RL
—
dc
1000
1.5
1.00
1.00
—
100
100
—
MHz
ns
ms
ms
t_CYC
Timer
Resolution⁽²⁾
Input capture pulse width
Input capture pulse period
Interrupt pulse width low (edge-triggered)
Interrupt pulse period
OSC1 pulse width
t_RESL
t_TH, t_TL
t_TLTL
tilih
t_ILIL
toh, tol
4.0
250
Note⁽³⁾
250
Note⁽⁴⁾
200
—
t_CYC
—
ns
—
t_CYC
—
ns
—
t_CYC
—
ns
1. V_DD = 3.3 Vdc ± 0.3 Vdc, V_SS = 0 Vdc, T_A = –40°C to +125°C, unless otherwise noted.
2. Because a 2-bit prescaler in the timer must count four internal cycles (t_CYC), this is the limiting minimum factor in determin-
ing the timer resolution.
3. The minimum period t_TLTL should not be less than the number of cycle times it takes to execute the capture interrupt service
routine plus 24 t_CYC.
4. The minimum t_ILIL should not be less than the number of cycle times it takes to execute the interrupt service routine plus
19 t_CYC.
TCAP PIN
t_TLTL
t_TH
t_TL
Figure 13-4. TCAP Timing Relationships
MC68HC05C8A • MC68HCL05C8A • MC68HSC05C8A Data Sheet, Rev. 5.1
Freescale Semiconductor
91